Pay Homage To The Light
Donating to the Temple of Light will make you look younger. The more you donate, the younger you will become.
Rest In The Bed At Fairfax Castle
Buy the Fairfax Castle and sleep in the bed. You will wake rested and have any scars removed. Return to the tower to sleep in the bed at any time to remove scars.
Rest In The Bed At Brightwood Tower
Buy the Brightwood Tower and complete the side quest. When you wake from the bed, you will be rested and appear younger. Return to the tower to sleep in the bed at any time to look younger.
Complete the Game
Once the game is over, you revert to your original age and are free to explore the land.